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Bookmark or Share- Observable universe | Definition, Size, Description, & Facts - BritannicaObservable universe, the region of space that humans can actually or theoretically observe with the aid of technology. The observable universe, which can be thought of as a bubble with Earth at its centre, is differentiated from the entirety of the universe, which is the whole cosmic system of
- Science & Tech | BritannicaThere are a lot of strange things in the universe, so why are planets round instead of every shape imaginable? How Fast Is the Universe Expanding? Learn why the Hubble constant doesn’t seem to be very constant.
- universe summary | Britannicauniverse, Whole cosmic system of matter and energy of which Earth is a part. Its main constituents are the galaxies , within which are star s and stellar groupings and nebulae ( see nebula ). Earth’s Sun is one star among the billions of stars in the Milky Way Galaxy .
- Cosmology | Definition & Facts | Britannica - Encyclopedia BritannicaCosmology, the field of study that brings together the natural sciences, particularly astronomy and physics, in a joint effort to understand the physical universe as a unified whole. When the universe is viewed in the large, a dramatic new feature, not present on small scales, emerges—the cosmological expansion.
- Astronomy - Cosmology, Universe, Stars | BritannicaAstronomy - Cosmology, Universe, Stars: Cosmology is the scientific study of the universe as a unified whole, from its earliest moments through its evolution to its ultimate fate. The currently accepted cosmological model is the big bang.
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